Parliamentary Affairs Minister Venkaiah Naidu has appealed all political parties to unite for the nation building over the issue of Good and Services Tax (GST) Bill. Addressing All India Builders Convention in Hyderabad, the Minister said, the passage of GST Bill might increase the GDP growth by 1.5 to 2 per cent.Facing Congress criticism that his Thursday's meeting with Sonia Gandhi on GST issue was mere a optics, Mr. Naidu said, the government is willing to accommodate the views of Congress party to the extent feasible. Any stalemate could only be resolved based on give and take, the Minister added.